MulticastSocket getOption(IP_MULTICAST_IF) returns interface when not set

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      The IP_MULTICAST_IF socket option is specified to have an initial value of null to mean that the interface has not been set. When the interface is not set MulticastSocket's getOption(IP_MULTICAST_IF) returns a NetworkInterface that appears to be valid (index >= 0) but is useless.

      The setOption/getOption methods are @since 9 so the compatibility impact of fixing this is probably low.

        1.
        		 Release Note: MulticastSocket getOption(IP_MULTICAST_IF) Returns null when outgoing interface not set Sub-task Closed Patrick Concannon (Inactive)  

            Assignee:
            Patrick Concannon (Inactive)
            Reporter:
            Alan Bateman
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